INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Provision for doubtful accounts	$ 10,188	$ 10,305
Closure, post-closure and remedial liabilities	28,206	28,665
Operating lease liabilities	42,218	38,151
Accrued expenses	20,455	16,797
Accrued compensation and benefits	24,504	11,372
Net operating loss carryforwards	68,381	50,433
Tax credit carryforwards	12,368	14,471
Interest rate swap liability	5,215	10,089
Stock-based compensation	2,705	3,040
Other	5,635	5,553
Total deferred tax assets	219,875	188,876
Deferred tax liabilities:
Property, plant and equipment	(273,883)	(194,604)
Operating lease right-of-use assets	(41,260)	(38,018)
Permits and other intangible assets	(138,241)	(95,492)
Prepaid expenses	(10,212)	(9,660)
Total deferred tax liabilities	(463,596)	(337,774)
Total net deferred tax liability before valuation allowance	(243,721)	(148,898)
Less valuation allowance	(69,806)	(77,044)
Net deferred tax liabilities	(313,527)	$ (225,942)
State net operating loss carryforwards, begin to expire in 2022	280,600
Federal operating loss carryforwards, begin to expire in 2024	124,100
Foreign net operating loss carryforwards, begin to expire in 2022	116,000
Foreign tax credit carryforwards, begin to expire between 2022 and 2024	$ 11,000